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Larger primary's, H/X pipe and low restriction mufflers ( reads straight throughs ) would all help. Running the CR up to 10 / 10.5. Tunnel ram would help. 4.88's would run you out of motor too soon IMO. Higher stall vert ( maybe 4500 / 5000 ) would help.

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The car picks up about a tenth, with the exhaust cut outs removed. I know that the Flowmasters are very poor flowing from what I've heard but I was kind of fond of the sound. I think the 5209's and the addition of an H pipe would help assuming the Flowmasters aren't the plug in the system. I did bump the compression from 7.8 to 9.1 by swapping from smogger pistons to a set from a 69 motor. I was under the impression it would come out closer to 10:1. I wouldn't have bothered if I knew better.

I do think that what I gain in the 60' with the 4.88's will probably be lost at the top due to the higher trap RPM as you mentioned. I may have to rethink that approach, although it did pick up going from 4:30's to 4:56's so who knows.

As far as converter goes, I did the math on the slippage and it was less than 10% as I recall. I would have to confirm that though. I would not necessarily be opposed to a higher stall converter on the street. Years ago we had a 3500 stall T.C.I in my Dads Belvedere. Up until the day it died, that converter worked awesome. His car has never launched the same with a 3500 JW in place of it. I would love to get another T.C.I to see how it would do.

Think a 4500 stall would be to high for such a low revving combo?